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VITEEE 2018 :: Chemistry :: General questions




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1.

In Williamson synthesis, if tertiary alkyl halide is used then


A) ether is obtained in good yield

B) ether is obtained in poor yield

C) alkene is the only reaction product

D) a mixture of alkene as a major product and ether as a minor product forms.



2.

In XeF2, XeF4, XeF6 the number of lone pairs on Xe are respectively


A) 2,3,1

B) 1,2,3

C) 4,1,2

D) 3,2,1



3.

In the series of reaction

$C_{6}H_{5}NH_{2} \xrightarrow[{0-5^{\circ}C}]{NaNO_{2}/HCl}X\xrightarrow[{H_{2}O}]{HNO_{2}}Y +N_{2}+HCl$

X and Y are Respectively


A) $C_{6}H_{5}-N=N-C_{6}H_{5},C_{6}H_{5}N_2^\oplus Cl^{\ominus}$

B) $C_{6}H_{5}N_2^\oplus Cl^{-},C_{6}H_{5}-N=N-C_{6}H_{5}$

C) $C_{6}H_{5}N_2^\oplus Cl^{-},C_{6}H_{5}NO_{2}$

D) $C_{6}H_{5}NO_{2},C_{6}H_{6},$



4.

For the reaction :

$2 BaO_{2}(s)\rightleftharpoons2BaO(s) + O_{2}(g);$

ΔH = +ve. In equilibrium condition, pressure of O2 is dependent on


A) $mass of BaO_{2}$

B) mass of BaO

C) temperature of equilibrium

D) $mass of BaO_{2} and BaO both$



5.

In case of nitrogen, NCl3 is possible but not NCl5 while in case of phosphorus, PCl3 as well as PCl5 are possible. It is due to


A) availability of vacant d orbitals in P but not in N

B) lower electronegativity of P than N

C) lower tendency of H-bond formation in P than N

D) occurrence of P in solid while N in gaseous state at room temperature



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